netdev - [PATCH net-next 2/7] net: bluetooth: compact struct bt_skb_cb by converting boolean fields to bit fields

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Date:	Thu, 26 Feb 2015 04:10:07 +0200
From:	Eyal Birger <eyal.birger@...il.com>
To:	davem@...emloft.net
Cc:	willemb@...gle.com, edumazet@...gle.com, shmulik.ladkani@...il.com,
	marcel@...tmann.org, netdev@...r.kernel.org,
	Eyal Birger <eyal.birger@...il.com>
Subject: [PATCH net-next 2/7] net: bluetooth: compact struct bt_skb_cb by converting boolean fields to bit fields

On 64 bit systems, struct bt_skb_cb size is padded by 6 bytes in order
to reach 8 byte alignment.
Convert boolean fields force_active, incoming and req_start to bit fields
in order to eliminate the padding.

Signed-off-by: Eyal Birger <eyal.birger@...il.com>
---
 include/net/bluetooth/bluetooth.h | 6 +++---
 net/bluetooth/hci_core.c          | 2 +-
 net/bluetooth/hci_request.c       | 2 +-
 net/bluetooth/hci_sock.c          | 2 +-
 4 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/include/net/bluetooth/bluetooth.h b/include/net/bluetooth/bluetooth.h
index 0989366..bb1851e 100644
--- a/include/net/bluetooth/bluetooth.h
+++ b/include/net/bluetooth/bluetooth.h
@@ -277,11 +277,11 @@ typedef void (*hci_req_complete_t)(struct hci_dev *hdev, u8 status, u16 opcode);
 
 struct bt_skb_cb {
 	__u8 pkt_type;
-	__u8 incoming;
 	__u16 opcode;
 	__u16 expect;
-	__u8 force_active;
-	bool req_start;
+	__u8 force_active:1;
+	__u8 incoming:1;
+	__u8 req_start:1;
 	u8 req_event;
 	hci_req_complete_t req_complete;
 	struct l2cap_chan *chan;
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 85a0655..80f40e8 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -3517,7 +3517,7 @@ int hci_send_cmd(struct hci_dev *hdev, __u16 opcode, __u32 plen,
 	/* Stand-alone HCI commands must be flagged as
 	 * single-command requests.
 	 */
-	bt_cb(skb)->req_start = true;
+	bt_cb(skb)->req_start = 1;
 
 	skb_queue_tail(&hdev->cmd_q, skb);
 	queue_work(hdev->workqueue, &hdev->cmd_work);
diff --git a/net/bluetooth/hci_request.c b/net/bluetooth/hci_request.c
index db2f45a..f857e76 100644
--- a/net/bluetooth/hci_request.c
+++ b/net/bluetooth/hci_request.c
@@ -116,7 +116,7 @@ void hci_req_add_ev(struct hci_request *req, u16 opcode, u32 plen,
 	}
 
 	if (skb_queue_empty(&req->cmd_q))
-		bt_cb(skb)->req_start = true;
+		bt_cb(skb)->req_start = 1;
 
 	bt_cb(skb)->req_event = event;
 
diff --git a/net/bluetooth/hci_sock.c b/net/bluetooth/hci_sock.c
index f003818..37198fb 100644
--- a/net/bluetooth/hci_sock.c
+++ b/net/bluetooth/hci_sock.c
@@ -965,7 +965,7 @@ static int hci_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
 			/* Stand-alone HCI commands must be flagged as
 			 * single-command requests.
 			 */
-			bt_cb(skb)->req_start = true;
+			bt_cb(skb)->req_start = 1;
 
 			skb_queue_tail(&hdev->cmd_q, skb);
 			queue_work(hdev->workqueue, &hdev->cmd_work);
-- 
2.1.4

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